I thought I'd found something earlier this week on that exact subject but can't find it in my history; but yes, you can reorder your Flow Pane objects in 2019.2 to help realign the flows and make them look more orderly. Click on an object and then drag into position. As you drag the pane will highlight where the next available spot will be for it to land. Hope that helps! If it does, please mark the response as helpful or if it answers your question, please mark as correct. Best, Don
The closest I could find is here: What's New - Tableau
Zach - Echoing what Zach said, I completely agree! Being a little bit of a control freak, I hated that I couldn't tidy my workflow. With Prep 2019.2, you're able to do this with ease.
Couple this with the documentation releases, allowing you to edit the name of tools & add descriptions, as well as tweak the colour of steps - it's slowly getting nicer as a piece of work which is easy to follow.